Construct UART Data Frame with Parity Bit

Code

#include <stdio.h>
#include <stdint.h>

typedef struct {
    uint8_t parity_enable : 1;
    uint8_t parity_type   : 1;
    uint8_t reserved      : 6;
} UART_Control;

uint8_t countSetBits(uint8_t num)
{
    uint8_t i = 0;
    uint8_t count = 0;
    for(i = 0; i<8; i++)
    {
        if(num & 1<<i){
            ++count;
        }
    }
    return count;
}

uint8_t create_uart_frame(uint8_t data, UART_Control *ctrl) {
    // Your logic here
    int frame = 0;
    if(ctrl->parity_enable == 0){
        return (data);
    }
    else{
        uint8_t count = countSetBits(data);
        frame = data;
        if( (count & 1) && (ctrl->parity_type==0) || 
        !(count & 1) && (ctrl->parity_type==1)){
            frame |= 1<<7;
        }
    }
    return frame;
}

int main() {
    uint8_t data;
    scanf("%hhu", &data);  // 7-bit input

    uint8_t parity_enable, parity_type;
    scanf("%hhu %hhu", &parity_enable, &parity_type);

    UART_Control ctrl;
    ctrl.parity_enable = parity_enable;
    ctrl.parity_type = parity_type;

    uint8_t frame = create_uart_frame(data, &ctrl);
    printf("frame = 0x%02X", frame);

    return 0;
}

Solving Approach